An Advertiser Creates a New Ad Group in a Campaign

An advertiser creates a new ad group in a campaign that is set to run on all relevant sites across the Google Display Network. If both keywords and placements are added to the ad group, they would work together to:

A) Impact the time of day that the ads are eligible to show.
B) Determine the target return on investment (ROI) for a given ad group
C) Impact search results and cost-per-click (CPC) on the Google Display Network.
D) Restrict the ads to specific sites and show them only when the content of a that site's page is relevant to the keywords.